Air film cooling hole structure
A technology of air film cooling and air film hole, which is applied in the direction of supporting elements of blades, engine elements, machines/engines, etc., which can solve the problem that the cooling air flow is easy to rush into the mainstream, the high blowing ratio is easy to blow off the wall, and the exit area of the cylindrical hole Small and other problems, to achieve the effect of simple structure, low price, and increase cooling efficiency
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[0038] Example 1
[0039] The film cooling hole structure of this embodiment (see Figure 1-4 ) Includes a film hole 1 and a wall surface 2, the outlet of the film hole is located in the upstream area of the wall surface, the film hole 1 includes a cylindrical section 11 and an expansion section 12, one end of the cylindrical section is a cold air inlet 13, and the cylindrical section The other end is connected to one end of the expansion section, and the other end of the expansion section is the outlet 14 of the air film hole. The expansion section 12 is composed of a middle hole 121 and two expansion holes 122. The middle hole and each expansion hole communicate with each other. In the top view of the wall, the two expansion holes are arranged axisymmetrically with the middle hole, that is, the outlet of the air film hole is an axisymmetric shape along the transverse direction of the wall, and the angle β between each expansion hole and the central axis of the middle hole is ...
Example Embodiment
[0046] Example 2
[0047] The film cooling hole structure of this embodiment (see Picture 10 The composition and positional relationship of the various parts of) are the same as those in embodiment 1, except that the hole type of the expansion hole 122 is a quadrangular prism, the angle β between each expansion hole and the central axis of the middle hole is 40°, and the expansion hole and the middle The pore diameter ratio is 0.5.
Example Embodiment
[0048] Example 3
[0049] The film cooling hole structure of this embodiment (see Picture 11 The composition and positional relationship of each part of) is the same as that of Example 1, the difference is that the middle hole of the expansion section is a tapered conical hole, which can allow more cooling air to flow through the expansion holes on both sides, which can increase the lateral cooling effect of the wall. And due to the shrinkage of the middle hole, the spanwise cooling effect at the center line of the wall will not be reduced, and the ratio of the diameter of the expanded hole to the middle hole is 0.85.
[0050] What is not mentioned in the present invention is applicable to the prior art.
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